Frequencies for first 10,000 rows of pct012k153 variable in sf12010880us30 dataset :

   46 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,010       90.10       90.10
          1 |        758        7.58       97.68
          2 |        156        1.56       99.24
          3 |         52        0.52       99.76
          4 |         17        0.17       99.93
          5 |          1        0.01       99.94
          6 |          1        0.01       99.95
          7 |          1        0.01       99.96
         10 |          1        0.01       99.97
         11 |          1        0.01       99.98
         17 |          1        0.01       99.99
         20 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017